<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>边框</title>
    <style type="text/css">
        div {
            /*width: 300px; 具体的像素*/
            width: 50%; /*百分比*/
            height: 100px;
            border: 1px dashed blue;
        }
    </style>
</head>
<body>
<div>韩顺平教育</div>
</body>
</html>
